It's all in what you like.
The 64 was the first, the original. Not one of the prettiest, but I'd love to have mine back today.
The 65-67 years are just beautiful. If you're looking for show, these are the years to get.
But if you're looking for go, then you have to look at those Ram Air III and IV years of the late 60's/early 70's.
And then we have the luxo-cruisers. Best road car I ever owned was a 72 455HO. Made it from Jacksonville, Florida to Atlanta, Georgia (350 miles) in four hours 12 minutes back in 1973.
But if you really want something unique, try a 73 or 74.
Different strokes for different folks.